ATI
Model F12/D Gas Transmitter
Part 4
– Operation
48
O&M Manual (Rev-H)
4.8 Alarm Menus, Methods, and Settings
The transmitter features three gas level alarms - Alarm, Warning, and Caution, and a Trouble alarm. Gas
level alarms are automatically configured when a gas sensor is installed, and are retained between same
type sensors. Alarm status appears on the Main Display, is available over the optional serial interface,
and is used to activate the three optional relays (see Relay Operation, Menus, and Settings on page 70).
Alarms Menu
The Alarms Menu is the main entry point for configuring gas level alarms, and for inhibiting and testing
configured alarms.
Figure 61. Alarms Menu
Gas Level Alarms
For toxic gas sensors, Alarm is a high-high
alarm and the default setting for Alarm is
normally 2 or 3 times higher than the TLV
(threshold limit value) of the target gas. The
Warning alarm is a high alarm and normally
set to the TLV. Caution is a low alarm and set
to activate on negative drift of
–10% of the
sensor range (a trouble alarm occurs if the
reading drifts to
–20% of the sensor range).
Figure 62 depicts the relationships of these
alarms.
Figure 62. Toxic Gas Alarms.
Item
Select to …
Alarm
Configure the Alarm settings to indicate a dangerous condition
(see
on pg 52).
Warning
Configure the Warning settings to indicate an unsafe condition
(see
on pg 52).
Caution
Configure the Caution settings (normally used to indicate
excessive sensor drift - see
on pg 52).
Inhibit
Configure or activate the manual alarm inhibit period (see
on pg 57)
Test
Test operation of the alarm indicators and relays (see
on pg 58)
Alarms
►Alarm Inhibit
Warning Test
Caution
Menu>Setup>Alarms
High-High Alarm
High Alarm
Toxic Gas
Low Alarm
